Evaluate each sum that exists.
(a) $\sum_{i=1}^{25}(20-3 i)$
(b) $\sum_{i=1}^{6} \frac{4}{3}(3)^{i}$
(c) $\sum_{i=1}^{\infty} 3\left(\frac{5}{4}\right)^{i}$
(d) $\sum_{i=1}^{\infty} 5\left(\frac{4}{5}\right)^{i}$

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The Answer of Evaluate each sum that exists.
(a) $\sum_{i=1}^{25}(20-3 i)$
(b) $\sum_{i=1}^{6} \frac{4}{3}(3)^{i}$
(c) $\sum_{i=1}^{\infty} 3\left(\frac{5}{4}\right)^{i}$
(d) $\sum_{i=1}^{\infty} 5\left(\frac{4}{5}\right)^{i}$

Evaluate Each Sum That Exists ∑i=125(20−3i)\sum_{i=1}^{25}(20-3 i)∑i=125​(20−3i) (B) ∑i=1643(3)i\sum_{i=1}^{6} \frac{4}{3}(3)^{i}∑i=16​34​(3)i (C) ∑i=1∞3(54)i\sum_{i=1}^{\infty} 3\left(\frac{5}{4}\right)^{i}∑i=1∞​3(45​)i

Evaluate Each Sum That Exists $\sum_{i=1}^{25}(20-3 i)$ (B) $\sum_{i=1}^{6} \frac{4}{3}(3)^{i}$ (C) $\sum_{i=1}^{\infty} 3\left(\frac{5}{4}\right)^{i}$